Harold Schaitberger told Hill.TV on Thursday that Trump has a lot of “audacity” to claim last month that he has “done more for Firefighters than this dues sucking union will ever do."

“I didn’t find that helpful and quite frankly I think it was counterproductive,” Schaitberger said.

The union leader added that despite the backlash, the IAFF hasn’t lost “any membership” over its endorsement. He estimated that out of 316,000 members across the country, 602 reached out to the union to criticize the move.

“One thing about firefighters, even when we disagree, we come together,” he told Hill.TV. “We don’t like anybody attacking our family from the outside … whether that’s on the job or in the political arena.”

Schaitberger said the union continues to be “all in” for Biden’s campaign for president. He emphasized that the organization plans to be very active throughout the Democratic primary and has already started planning for its early primary caucus and state operations.

“I’m very confident we’ll be successful and Joe will become the nominee and the next president,” he told Hill.TV.

Since the launch of his president campaign in April, Biden has touted his close ties to labor unions. He kicked off his official White House bid by hosting a union event in Pittsburgh.

"I make no apologies. I am a union man. Period," Biden told the crowd.

A number of other 2020 Democratic candidates are also aiming to win the support of unions.

A former campaign staffer on President Obama's 2008 campaign is urging Sen. Kamala Harris (D-Calif.) to "own" her policy positions, saying such a move will help regain her momentum in the primary race.

College students named Sen. Elizabeth Warren (D-Mass.) the winner of Thursday night’s third Democratic presidential debate, according to a Chegg-College Pulse poll conducted immediately following the event.

The founder and host of the left-leaning online show "The Young Turks" named tech entrepreneur Andrew Yang and Sen. Bernie Sanders (I-Vt.) as the top winners of Thursday night’s Democratic primary debate.

The founder of the progressive online channel "The Young Turks" on Friday criticized former Housing and Urban Development Secretary Julián Castro for going after former Vice President Joe Biden during last night’s debate, saying the move was too aggressive.

A top campaign official for Sen. Bernie Sanders told Hill.TV on Thursday that the Democratic presidential candidate not only has both the right ideas to move the U.S. forward and the courage to carry them out.

A Trump campaign aide on Thursday said in an appearance on Hill.TV that every time 2020 Democratic presidential contenders take the stage the president wins, adding that many of the White House hopefuls are “alienating” voters with policy proposals such as the Green New

Republican strategist Lauren Claffey said Wednesday that Wall Street and others have become fearful about the possibility of Sen. Elizabeth Warren (D-Mass.) becoming president because she’s built a reputation on taking on big banks.

Sen. Kamala Harris (D-Calif.) and former tech entrepreneur Andrew Yang have been climbing in the Democratic presidential race, while the three front-runners – former Vice President Joe Biden, Sen. Elizabeth Warren (D-Mass.), and Sen.

Times are dark. The world is troubled. Something called "black rod" is destroying our greatest ally. Let’s indulge if you will join me in a plausible fantasy of sorts. You ready? What if Bernie Sanders won Texas?

An overwhelming majority of voters said in a new national survey that they prefer their elected official to reach across the aisle to find solutions rather than stick to working with members of their own party.